BASS SEAT IN THE HOUSE

摘要

I wonder if you can help? Back in 1997 I built a window seat subwoofer to a design published in Hi-Fi News. I made it using 3/4in high density chipboard and it worked extremely well. After trying sawdust, I filled the whole unit with sand and had about 13ft of tuned pipe running through it. I can't believe the amount of PVA and screws I used to make it all airtight! I fed mine with a 150W FET amplifier through an adjustable low pass filter (LPF) with a cut-off at 60Hz. My mains came in at 50Hz while the measured response in my living room (40×15ft) was 18Hz-50Hz (-3dB points). I was using an old Tandy 12in speaker with a foam surround and fitted sticky felt pads on the cone to bring the free air resonance down to 21Hz.